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'use strict';
var strCompare = require('../string/#/case-insensitive-compare')
, isObject = require('./is-object')
, resolve, typeMap;
typeMap = {
undefined: 0,
object: 1,
boolean: 2,
string: 3,
number: 4
};
resolve = function (a) {
if (isObject(a)) {
if (typeof a.valueOf !== 'function') return NaN;
a = a.valueOf();
if (isObject(a)) {
if (typeof a.toString !== 'function') return NaN;
a = a.toString();
if (typeof a !== 'string') return NaN;
}
}
return a;
};
module.exports = function (a, b) {
if (a === b) return 0; // Same
a = resolve(a);
b = resolve(b);
if (a == b) return typeMap[typeof a] - typeMap[typeof b]; //jslint: ignore
if (a == null) return -1;
if (b == null) return 1;
if ((typeof a === 'string') || (typeof b === 'string')) {
return strCompare.call(a, b);
}
if ((a !== a) && (b !== b)) return 0; //jslint: ignore
return Number(a) - Number(b);
};
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